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• Use one single DLL library to import other libraries at runtime

  - by Yifan

  I am writing a Win32 DLL library that can be redistributed. I am using different versions of the windows API because I want to support Windows 7 functions, but still have support for Windows 2000 (with some function disabled). What I have currently is MyLib2000.dll, MyLibXP.dll, and MyLibVista.dll, and my application chooses which library to load at runtime. I want a way to have a single DLL (MyLib.dll) that stores the other three in itself and when it's being loaded, it extracts the correct DLL out of itself and loads it. I know this is not the best way to do this, so suggestions on another method of doing this is welcome.

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• Load two instances of the same DLL in Delphi

  - by Tom

  Here's my problem: I would like to create two separate instances of the same DLL. The following doesn't work because Handle1 and Handle2 will get the same address Handle1 := LoadLibrary('mydll.dll'); Handle2 := LoadLibrary('mydll.dll'); The following works, but I have to make a copy of the DLL and rename it to something else (which seems a bit silly) Handle1 := LoadLibrary('mydll.dll'); Handle2 := LoadLibrary('mydll2.dll'); Is there a way to have only one DLL file, but load several instances of it?

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• Compile for mixed platform (32, 64) and reference a 32 or 64 bit DLL resolved at runtime

  - by Nigel Aston

  Using VS2010 under windows 32 or 64 bit. Our C# app calls a 3rd party DLL (managed) that interfaces to an unmanaged DLL. The 3rd party DLL API appears identical in 32 or 64 bit although underneath it links to a 32 or 64 bit unmanaged DLL. We want our C# app to run on either 32 or 64 bit OS, ideally it will auto detect the OS and load the appropriate 32rd party DLL - via a simple factory class which tests the Enviroment. So the neatest solution would be a runtime folder containing: OurApp.exe 3rdParty32.DLL 3rdPartyUnmanaged32.DLL 3rdParty64.DLL 3rdPartyUnmanaged64.DLL However, the interface for the managed 3rdParty 32 and 64 dll is identical so both cannot be referenced within the same VS2010 project: when adding the second the warning triangle is shown and it does not get referenced. Is my only answer to create two extra library DLL projects to reference the 3rdParty 32 and 64 Dlls? So I would end up with this project arrangement: Project 1: Builds OurApp.exe, dynamically creates an object for project2 or project3. Project 2: Builds OurApp32.DLL which references 3rdParty32.dll Project 3: Builds OurApp64.DLL which references 3rdParty64.dll

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• Is ther any DLL or DLL like concept in Android?

  - by Prashant

  Hello, We know that we can use a concept "Java Package" but I just wanted to know that whether Android has provided a DLL or DLL like concept where we can write a most of the functionality. Or can we use Activity for serving a purpose of DLL. Can any one tell me is there any concept like DLL on Android OS? Can we develop a DLL for better modularization and other benefits on Android? Thanks and Regards, Prashant.

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• Unable to load dll error

  - by ratty

  i am working project in c#,i am using c++ dll in my project and also i call that dll through my function . In my system the project run successfully.but in other system it shows exception like unable to load dll. i am check that dll in dependency walker it shows msvcr71.dll is missing.how i get this.?

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• Should I redistribute msvcrt.dll with my application?

  - by kr

  Should I redistribute msvcrt.dll with my application and use the private dll if some of the application's libs dynamically depend on msvcrt.dll? I.e. are any incompatibility issues possible with the system's msvcrt.dll (dll hell)? Application is targeted for Windows Server systems.

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• Using regsvr32, do you need to unregister a dll or ocx before registering it again?

  - by Craig Johnston

  Using regsvr32, do you need to unregister a dll or ocx before registering it again? Or will registering it do that anyway?

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• Windows/C++: how to use a COM dll which is not registered

  - by Albert

  Hi, In our application, we need to use a COM dll (namely msdia100.dll) which was not registered in the system before. Earler, we have just called the DLL by calling its DllRegisterServer via this code: // Register DIA DLL required by Breakpad std::string diaLibPath = "msdia100"; HMODULE diaLib = LoadLibrary(diaLibPath.c_str()); if( diaLib == NULL ) { errors << "Cannot load DLL " << diaLibPath << endl; return; } typedef HRESULT ( __stdcall * regServer_t )(void); regServer_t regServer = (regServer_t)GetProcAddress(diaLib, "DllRegisterServer"); if( regServer == NULL ) { errors << "Cannot get method DllRegisterServer from " << diaLibPath << endl; FreeLibrary(diaLib); return; } if( regServer() != S_OK ) { errors << "Cannot call DllRegisterServer from " << diaLibPath << endl; } FreeLibrary(diaLib); This doesn't work anymore on Windows 7 (maybe also Vista, didn't tried) because to call this function, it needs Administrator privileges. All solutions to this problem I have found where about getting those Admin rights. That is no possible solution for us because our application must also work if the user is not able to get those Admin rights. It is also no solution for us to suddenly need an installer for our application which registeres this DLL. So, what possibilities are there? How can I use this DLL without Admin rights? Do I have to recode COM which works without the need to register a DLL first?

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• Calling a non-activeX DLL in a VB6 application in Vista/Win7

  - by user1490330

  I have a VB6 app that utilizes a non-activeX DLL (non-registering). It's declared via the classic Public Declare Function "Function Name" Lib "Library.DLL" syntax. On my dev machine (XP) it works fine but when I deploy to Vista or Win7 I'm constantly greeted with a Run Time Error 48 - File Not Found for the DLL in question. I have tried copying that DLL to every directory I can think of including every environment path on the test machine and the app path too. These are all 32-bit test environments so it's not a SysWow64 issue. Possibly throwing a wrench into the mix is the fact that the application in question is an Outlook COM Addin. I managed to install VB6 on Win7 and was able to run a tiny sample app that utilizes this DLL (outside of the Outlook process) so I know it works PROVIDED the DLL is located in App path. If I call App.Path from my DLL when I run it on the test environment it shows, to no surprise, my installation directory however the DLL is there. I tried turning off UAC. I tried making the App.Path directory permissions open to everyone, still no dice.

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• Loading multiple copies of a group of DLLs in the same process

  - by george

  Background I'm maintaining a plugin for an application. I'm Using Visual C++ 2003. The plugin is composed of several DLLs - there's the main DLL, that's the one that the application loads using LoadLibrary, and there are several utility DLLs that are used by the main DLL and by each other. Dependencies generally look like this: plugin.dll - utilA.dll, utilB.dll utilA.dll - utilB.dll utilB.dll - utilA.dll, utilC.dll You get the picture. Some of the dependencies between the DLLs are load-time and some run-time. All the DLL files are stored in the executable's directory (not a requirement, just how it works now). The problem There's a new requirement - running multiple instances of the plugin within the application. The application runs each instance of a plugin in its own thread, i.e. each thread calls The plugin's code, however, is nothing but thread-safe - lots of global variables etc.. Unfortunately, fixing the whole thing isn't currently an option, so I need a way to load multiple (at most 3) copies of the plugin's DLLs in the same process. Option 1: The distinct names approach Creating 3 copies of each DLL file, so that each file has a distinct name. e.g. plugin1.dll, plugin2.dll, plugin3.dll, utilA1.dll, utilA2.dll, utilA3.dll, utilB1.dll, etc.. The application will load plugin1.dll, plugin2.dll and plugin3.dll. The files will be in the executable's directory. For each group of DLLs to know each other by name (so the inter-dependencies work), the names need to be known at compilation time - meaning the DLLs need to be compiled multiple times, only each time with different output file names. Not very complicated, but I'd hate having 3 copies of the VS project files, and don't like having to compile the same files over and over. Option 2: The side-by-side assemblies approach Creating 3 copies of the DLL files, each group in its own directory, and defining each group as an assembly by putting an assembly manifest file in the directory, listing the plugin's DLLs. Each DLL will have an application manifest pointing to the assembly, so that the loader finds the copies of the utility DLLs that reside in the same directory. The manifest needs to be embedded for it to be found when a DLL is loaded using LoadLibrary. I'll use mt.exe from a later VS version for the job, since VS2003 has no built-in manifest embedding support. I've tried this approach with partial success - dependencies are found during load-time of the DLLs, but not when a DLL function is called that loads another DLL. This seems to be the expected behavior according to this article - A DLL's activation context is only used at the DLL's load-time, and afterwards it's deactivated and the process's activation context is used. I haven't yet tried working around this using ISOLATION_AWARE_ENABLED. Questions Got any other options? Any quick & dirty solution will do. :-) Will ISOLATION_AWARE_ENABLED even work with VS2003? Comments will be greatly appreciated. Thanks!

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• Global WH_CBT hook DLL is loaded into some processes only

  - by kriau

  The main program calls the function SetHook in the wi.dll to install global WH_CBT hook. bool WI_API SetHook() { if (!g_hHook) { g_hHook = SetWindowsHookEx(WH_CBT, (HOOKPROC) CBTProc, g_hInstDll, 0); } return g_hHook != NULL; } I presume after installing global hook, wi.dll should be loaded into each process' address space. However wi.dll is loaded in to some processes only. For example, if I start Skype, MS Word I can see that wi.dll is loaded into these processes as well (using Process Explorer), however if I run Firefox, uTorrent, Adobe Reader then wi.dll is not loaded into these processes. I'm using W7 64-bit, main program and wi.dll is 32-bit, all programs mentioned here is 32-bit programs as well. Any ideas why that happens? Thanks in advance.

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• Can I expose only a portion of one .NET DLL's public classes via a different "API" DLL?

  - by Ben McIntosh

  I am designing a WPF application that uses a DLL with maybe 40 public classes. I need these to be public for a variety of reasons including ease of data binding and obfuscation. I would like to allow other people to use only a portion of these classes as an API for my software. I thought I would create the main library (core.dll) and an API library (coreAPI.dll) with the API DLL to be referenced in a new project. Is there a way to allow coreAPI.dll to expose only a few of the classes that exist in core.dll? It's not so much a security issue as I primarily want to simply hide some of the unwanted classes from the Visual Studio Intellisense. Again, internal classes for the ones I want to hide is not really an option because I need to data bind some of these classes in WPF and for that, they must be public. Are there any other ways of doing this?

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• The difference between traditional DLL and COM DLL.

  - by smwikipedia

  I am currently studying COM. I found that COM DLL is kind of built upon the traditional DLL infrastructure. When we build COM DLLs, we still rely on the traditional DLL export methods to lead us to the internal COM co-classes. If COM is for component reusing at the binary level, I think the traditional DLL can achieve the same thing. They both expose functions, they are both binary, so what's the point of turning to COM approach? Currently, I have the feeling that the traditional DLL expose methods in a "flat" manner, while the COM DLL expose methods in an "OOP" hierarchy manner. And the OOP manner seems to be a better approach. Could this be the reason why COM prevails? Many thanks.

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• DLL response is too slow in Visual Studio [Resolved]

  - by magsto

  I use a 3rd party DLL in my VB.NET project (VS2005) that responds to slow and give wrong values in debug mode. In run-time mode everything works as expected. I do understand that there are something going on in the debug mode which makes the DLL communication slow. This behavior makes it hard to debug the application correctly. Is there any way to force VS to communicate with the DLL in "run-time" mode during debugging but let the rest of the project be in control of the debugger? I found a setting that resolved my issue: Project Properties Debug Enable Debuggers select "Enable unmanaged code debugging". Now the DLL communication flowed smoothly. The DLL I use is a middleware between my app and a USB device. There is no Debug/Release version of the DLL.

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• C++ DLL creation for C# project - No functions exported

  - by Yeti

  I am working on a project that requires some image processing. The front end of the program is C# (cause the guys thought it is a lot simpler to make the UI in it). However, as the image processing part needs a lot of CPU juice I am making this part in C++. The idea is to link it to the C# project and just call a function from a DLL to make the image processing part and allow to the C# environment to process the data afterwards. Now the only problem is that it seems I am not able to make the DLL. Simply put the compiler refuses to put any function into the DLL that I compile. Because the project requires some development time testing I have created two projects into a C++ solution. One is for the Dll and another console application. The console project holds all the files and I just include the corresponding header into my DLL project file. I thought the compiler should take out the functions that I marked as to be exported and make the DLL from them. Nevertheless this does not happens. Here it is how I defined the function in the header: extern "C" __declspec(dllexport) void _stdcall RobotData(BYTE* buf, int** pToNewBackgroundImage, int* pToBackgroundImage, bool InitFlag, ObjectInformation* robot1, ObjectInformation* robot2, ObjectInformation* robot3, ObjectInformation* robot4, ObjectInformation* puck); extern "C" __declspec(dllexport) CvPoint _stdcall RefPointFinder(IplImage* imgInput, CvRect &imgROI, CvScalar &refHSVColorLow, CvScalar &refHSVColorHi ); Followed by the implementation in the cpp file: extern "C" __declspec(dllexport) CvPoint _stdcall RefPointFinder(IplImage* imgInput, CvRect &imgROI,&refHSVColorLow, CvScalar &refHSVColorHi ) { \\... return cvPoint((int)( M10/M00) + imgROI.x, (int)( M01/M00 ) + imgROI.y) ;} extern "C" __declspec(dllexport) void _stdcall RobotData(BYTE* buf, int** pToNewBackgroundImage, int* pToBackgroundImage, bool InitFlag, ObjectInformation* robot1, ObjectInformation* robot2, ObjectInformation* robot3, ObjectInformation* robot4, ObjectInformation* puck) { \\ ...}; And my main file for the DLL project looks like: #ifdef _MANAGED #pragma managed(push, off) #endif /// <summary> Include files. </summary> #include "..\ImageProcessingDebug\ImageProcessingTest.h" #include "..\ImageProcessingDebug\ImageProcessing.h" BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) { return TRUE; } #ifdef _MANAGED #pragma managed(pop) #endif Needless to say it does not work. A quick look with DLL export viewer 1.36 reveals that no function is inside the library. I don't get it. What I am doing wrong ? As side not I am using the C++ objects (and here it is the C++ DLL part) such as the vector. However, only for internal usage. These will not appear in the headers of either function as you can observe from the previous code snippets. Any ideas? Thx, Bernat

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• Determine version of dll linked against

  - by ron

  According to this article, the version of a referenced dll is embedded in the exe file. Using ProcExp, I can see that the runtime loaded dll is indeed the latest dll available on my machine, but I'm interested to know the linked version. As a side note, I built the project using the VS9 msbuild, and interested in the VC runtime (msvcr90.dll) version. In the VC9 redist folder it is 9.0.30729.1, runtime the .4926 is loaded. My questions are: Is there any tool with which I can extract the dll version linked to (from the dll/exe)? Which version does VS link to by default? The one found in its redist folder? Thank you.

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• How to add a web service reference in a DLL

  - by dan

  I'm creating a DLL with a reference to web services (I don't have the choice to do so) but I have to add web service references to the project that uses the DLL for it to work. Example, I have the DLL called API.DLL that calls a web service called WebService.svc that I want to use in a project called WinForm. First, I have to add a "Service Reference" to WebService.svc in API.DLL. Then, I add a reference API.DLL to WinForm but it doesn't work unless I also add a service reference to WebService.svc in WinForm. What can I do to avoid that last step?

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• What are the icons contained in the Windows 7 shell32.dll

  - by ahsteele

  I wanted to change the icon used for a Custom Library I've created in Windows 7. I found a great article How to Customize the Library Icons in Windows 7 which describes exactly how to do that. However, the article uses shell32.dll and a icon location to do so. I have found an image map detailing the icons location in shell32.dll in Windows XP but was wondering if anyone knew of something similar for Windows 7.

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• dll doesn't show up in system32 directory in Windows 7

  - by Phenom

  I copied a dll to the system32 directory. I want to register it, which requires me to be Administrator. If I right click on cmd.exe and run as Administrator and list the directory, the dll isn't shown. However, if I start cmd.exe normally, I can see the file, but can't register it.

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• What are the A0xxxxxx.DLL files?

  - by Joel Coehoorn

  If you've ever watched a windows computer defrag a drive, you might have noticed that many of the files that are fragmented and need fixed have names like A0833773.DLL. If you know regular expressions, I could express the filename this way: A\d{7}[.]DLL Does anyone here know what those files are or what they're used for?

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• How to debug manifest errors?

  - by Rryk

  I am creating an application that depends on third-party library, which in turn depends on MSVCP90D.dll (it was compiled with debug symbols). While starting the application it fails to start and provides an error message: I have found such library in C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\redist\Debug_NonRedist\amd64\Microsoft.VC90.DebugCRT and C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\redist\Debug_NonRedist\x86\Microsoft.VC90.DebugCRT. As you can see one of them is 64-bit, while the other is 32-bit. When I have placed 32-bit into the directory of the application the application silently crashes while loading (log from Visual Studio Output window is below). With the 32-bit one I get another error message: If I press Abort -- programs shuts down, Retry results in breaking into debug session for crt0msg.c file. This is system file and I have no idea how to debug it. If I press Ignore I get yet another error message: So the question is how to debug such errors? Please give me some links where I can read more about it or point me out what exactly I should do in such cases. I know this relates to manifest problems -- please give me a good resource where I can read about resources, since what I have found have confused me even more. This is log for 64-bit version of the MSVCP90D.dll library: 'chrome.exe': Loaded 'D:\Projects\Chromium\devenv\install\build-msvc-debug\chromium-xml3d-rtsg2\chrome.exe', Symbols loaded. 'chrome.exe': Loaded 'C:\Windows\SysWOW64\ntdll.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\kernel32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\KernelBase.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\user32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\gdi32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\lpk.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\usp10.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\msvcrt.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\advapi32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\sechost.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\rpcrt4.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\sspicli.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\cryptbase.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\shell32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\shlwapi.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\winmm.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\version.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\psapi.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\imm32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\msctf.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'D:\Projects\Chromium\devenv\install\build-msvc-debug\chromium-xml3d-rtsg2\chrome.dll', Symbols loaded. 'chrome.exe': Loaded 'C:\Windows\SysWOW64\ole32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\oleaut32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\winsxs\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7600.16385_none_421189da2b7fabfc\comctl32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\oleacc.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\opengl32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\glu32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\ddraw.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\dciman32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\setupapi.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\cfgmgr32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\devobj.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\dwmapi.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'C:\Windows\SysWOW64\secur32.dll', Symbols loaded (source information stripped). 'chrome.exe': Loaded 'D:\Projects\Chromium\devenv\install\build-msvc-debug\rtsg2\bin\RTSG2.dll', Symbols loaded. 'chrome.exe': Unloaded 'D:\Projects\Chromium\devenv\install\build-msvc-debug\chromium-xml3d-rtsg2\chrome.dll' 'chrome.exe': Unloaded 'D:\Projects\Chromium\devenv\install\build-msvc-debug\rtsg2\bin\RTSG2.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\secur32.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\opengl32.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\ddraw.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\dwmapi.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\setupapi.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\devobj.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\cfgmgr32.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\dciman32.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\glu32.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\oleacc.dll' 'chrome.exe': Unloaded 'C:\Windows\winsxs\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7600.16385_none_421189da2b7fabfc\comctl32.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\oleaut32.dll' 'chrome.exe': Unloaded 'C:\Windows\SysWOW64\ole32.dll' 'chrome.exe': Loaded 'C:\Windows\SysWOW64\ole32.dll', Symbols loaded (source information stripped). The program '[1152] chrome.exe: Native' has exited with code 9 (0x9).

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• C++: Explicit DLL Loading: First-chance Exception on non "extern C" functions

  - by Shiftbit

  I am having trouble importing my C++ functions. If I declare them as C functions I can successfully import them. When explicit loading, if any of the functions are missing the extern as C decoration I get a the following exception: First-chance exception at 0x00000000 in cpp.exe: 0xC0000005: Access violation. DLL.h: extern "C" __declspec(dllimport) int addC(int a, int b); __declspec(dllimport) int addCpp(int a, int b); DLL.cpp: #include "DLL.h" int addC(int a, int b) { return a + b; } int addCpp(int a, int b) { return a + b; } main.cpp: #include "..DLL/DLL.h" #include <stdio.h> #include <windows.h> int main() { int a = 2; int b = 1; typedef int (*PFNaddC)(int,int); typedef int (*PFNaddCpp)(int,int); HMODULE hDLL = LoadLibrary(TEXT("../Debug/DLL.dll")); if (hDLL != NULL) { PFNaddC pfnAddC = (PFNaddC)GetProcAddress(hDLL, "addC"); PFNaddCpp pfnAddCpp = (PFNaddCpp)GetProcAddress(hDLL, "addCpp"); printf("a=%d, b=%d\n", a,b); printf("pfnAddC: %d\n", pfnAddC(a,b)); printf("pfnAddCpp: %d\n", pfnAddCpp(a,b)); //EXCEPTION ON THIS LINE } getchar(); return 0; } How can I import c++ functions for dynamic loading? I have found that the following code works with implicit loading by referencing the *.lib, but I would like to learn about dynamic loading. Thank you to all in advance.

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• PInvokeStackImbalance -- C# with offreg.dll ( windows ddk7 )

  - by user301185

  I am trying to create an offline registry in memory using the offreg.dll provided in the windows ddk 7 package. You can find out more information on the offreg.dll here: MSDN Currently, while attempted to create the hive using ORCreateHive, I receive the following error: "Managed Debugging Assistant 'PInvokeStackImbalance' has detected a problem. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature." Here is the offreg.h file containing ORCreateHive: typedef PVOID ORHKEY; typedef ORHKEY *PORHKEY; VOID ORAPI ORGetVersion( __out PDWORD pdwMajorVersion, __out PDWORD pdwMinorVersion ); DWORD ORAPI OROpenHive ( __in PCWSTR lpHivePath, __out PORHKEY phkResult ); DWORD ORAPI ORCreateHive ( __out PORHKEY phkResult ); DWORD ORAPI ORCloseHive ( __in ORHKEY Handle ); The following is my C# code attempting to call the .dll and create the pointer for future use. using System.Runtime.InteropServices; namespace WindowsFormsApplication6 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } [DllImport("offreg.dll", CharSet = CharSet.Auto, EntryPoint = "ORCreateHive", SetLastError=true, CallingConvention = CallingConvention.StdCall)] public static extern IntPtr ORCreateHive2(); private void button1_Click(object sender, EventArgs e) { try { IntPtr myHandle = ORCreateHive2(); } catch (Exception r) { MessageBox.Show(r.ToString()); } } } } I have been able to create pointers in the past with no issue utilizing user32.dll, icmp.dll, etc. However, I am having no such luck with offreg.dll. Thank you.

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• Dll Import : Unable to find Entry Point "fnMultiply" in DLL "ImportDLL"

  - by user662285

  I am trying to use DLLImport for using Win32 dll method in C#. Win32 dll C++ // .h file #ifdef IMPORTDLL_EXPORTS #define IMPORTDLL_API __declspec(dllexport) #else #define IMPORTDLL_API __declspec(dllimport) #endif // This class is exported from the ImportDLL.dll class IMPORTDLL_API CImportDLL { public: CImportDLL(void); // TODO: add your methods here. int Add(int a , int b); }; extern IMPORTDLL_API int nImportDLL; IMPORTDLL_API int fnImportDLL(void); IMPORTDLL_API int fnMultiply(int a,int b); // .cpp file // ImportDLL.cpp : Defines the exported functions for the DLL application. // #include "stdafx.h" #include "ImportDLL.h" // This is an example of an exported variable IMPORTDLL_API int nImportDLL=0; // This is an example of an exported function. IMPORTDLL_API int fnImportDLL(void) { return 42; } IMPORTDLL_API int fnMultiply(int a , int b) { return (a*b); } Once i build this i get ImportDLL.dll Now i create Windows Application and add this dll in debug folder and try to use this method using DLLImport [DllImport("ImportDLL.dll")] public static extern int fnMultiply(int a, int b); And I try to call this in C# int a = fnMultiply(5, 6); // This line gives error Unable to find an entry point Can any body tell what i am missing? Thanks.

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• Tracking down slow managed DLL loading

  - by Alex K

  I am faced with the following issue and at this point I feel like I'm severely lacking some sort of tool, I just don't know what that tool is, or what exactly it should be doing. Here is the setup: I have a 3rd party DLL that has to be registered in GAC. This all works fine and good on pretty much every machine our software was deployed on before. But now we got 2 machines, seemingly identical to the ones we know work (they are cloned from the same image and stuffed with the same hardware, so pretty much the only difference is software settings, over which I went over and over, and they seem fine). Now the problem, the DLL in GAC takes a very long time to load. At least I believe this is the issue, what I can say definitively is that instantiating a single class from that DLL is the slow part. Once it is loaded, thing fly as they always have. But while on known-good machines the DLL loads so fast that a timestamp in the log doesn't even change, on these 2 machines it take over 1min to load. Knowns: I have no access to the source, so I can't debug through the DLL. Our app is the only one that uses it (so shouldn't be simultaneous access issues). There is only one version of this DLL in existance, so it shouldn't be a matter of version conflict. The GAC reference is being used (if I uninstall the DLL from GAC, an exception will be thrown about the missing GAC reference). Could someone with a greater skill in debug-fu suggest what I can do to track down the root cause of this issue?

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